Wabeex p



(N0 model') 2 Sheets-Sheet 1.

W. P. FREEMAN.

GOVERNOR FOR DYNAMO ELECTRIC MACHINES.

No. 290,025. Patented Dec. 11, 1883.

- WITNESSES INVENTOR:

(No Model.) 2 Sheets-Sheet 2.

W. P. FREEMAN.

GOVERNOR FOR DYNAMO ELECTRIC MACHINES.

No. 290,025. PatentedDec. 11, 1883.

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UNITED STATES PATENT OFFICE.

VARREN P. FREETWIAN, OF BROOKLYN, NEW YORK, ASSIGNOR TO \VILLIAM F. J OBBINS, OF SAME PLACE.

GOVERNOR FOR DYI-NAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 290,025, dated December 11,1883.

Application filed mm. 15,1883. (x0 model.)

Zo all whom it may concern:

Be it known that I, WARREN P. FREEMAN, a citizen of the United States, and a resident of Brooklyn, Kings county, New York, have invented certain Improvements in Governors for Dynamo-Electric Machines, of which the following isa specification.

The object of my invent-ion is to construct a simple. governing device for automatically regulating the current from a dynamo-electric machine, and this-object Iv attain by combining the fieldnnagnet coils wit-ha commutator and a movable contact controlled'by an armature acted on by one of the poles of the field-magnet, as more fully described hereinafter.

In the accompanying drawings, Figure 1 is an end view of a dynamo-electric machine having lnyimproven'icnt applied thereto, and Fig. 2 a diagram illustrating the circuits.

The dynamo -eleotric machine may be of almost any of the various well-known eonstructions; but I prefer that shown in the drawings, in which A indicates the armat-ure; M, M, M, and M, the field-magnet coils; B B, the curvedpoles; D, the top connectingplatc, and D t-hebase.

One or both of the coils M M? have connected to them at anumber of different points conductors l 2 3 4, &e., which are also e'lec trically connect'cd'with the .insulated plates 1 2' 3 4, &c., of the commutator E, preferably mounted on the top plate, D, so that by putting the working-circuit in electric connection with one or other of these commutator-plates fewer or-more of the coils of the field-magnets will be cut out,v of. circuit, and

the current proportionately increased or diininished.

To lugs, f on one of the pole-pieces B is pivoted an armature -lcver, F, carrying a curved armature, F, adapted to be directly acted on by the pole-piece B. The other end of the armature-lever extends above the top plate, 1), and carries a contact brush or piece, 0, which can be moved over and in electrical contact with the connnut-ator-plates E. A spring, H, acts on the lever F, to counterbalance the magnetic attraction of the pole-piece for the armature, and can be adjusted bysuitable means to the desired tension.

One of the binding-posts,m,for the external circuit is connected, to the terminal of the non-sectional coils, while the other, m, is in electrical contact with the lever F and its contact-point e. The conductor 1 runs from the first section or coil of the field, and the branch 2 from the second section, and so on, so that when the brush 6 is in contact with the plate 1' all the coils of the field will be in circuit; but when the brush is moved over into contact "with 2 the first section or coil of the field will be cutout, and a proportionate reduction in the current in the working circuit results. This reduction will increase as the brush is moved over the commutator away from plate 1. The spring H is so adjusted that when the machine is producing the normal or desired current it will balance the magnetic attraction on the armature F; but when there is an undue increase in the current the magnet-ism of the pole B will increase, so as to attract the armature F against the pull of the spring and move the brushe over the commutator away from the plate 1,to cut out one or more sections of the coils, and thereby reduce the current to the normalpoint. In like inanuer, on an undue decrease in the current, the spring H will overbalance the magnetic attraction on the arinat-uretand move the'lever F over to include more of the coils in the circuit.

It is not'essential that the contact-brush 0 should be carried by the armature-lever F, as it may be carried by a lever operated by the latter with good effect, and a balance-weight may be substituted for the spring, as indicated by dotted lines, and the point of location of thearmature-lever and commutator may be changed, so long as the armature F is arranged to be acted on by one of the poles of the field-magnets themselves, for, owing to this construction, I am enabled to dispense with the use of an clectro-magnct in the external the field-magnets a dynamo-electric machine with a commutator In testimony whereof I have signed my name having its plates electrically connected with to this specificationin the presence of two subn different sections of the field-coils, an armascribing Witnesses.

tare-lever carrying an armature acted on\by 1;. w r

a pole of the fieldqnalgnets, adjustable spring VAwlvmN FREEMAN or balance, and a contact, 6, adapted to be lVitnesses:

moved over the said commutator by the ar- HUBERT HOWSON,

mature-lever, all substantially as set forth. JAMES C. EADIE. 

